They should forbid for attackers a zone swaping becouse if you are FE deffending A, you are getting flanked by those attackers spawned on B from your left and basicly u need to sack A in 30 sec to 1 min if couple of engeeniers get in cap fast.

At least make it forbiden until you cap all you A B C if you are attacking then you can change flank, i dont buy that story that its ~ 50%WR for both attackers and deffenders.